I have swapped off the runflats from my current and all my previous BMW's, it makes such a big improvement to how the car rides and handles, no need to change springs or damper settings, and well worth the risk of a puncture imho. My bmw dealer sources and fits the std tyres no problem, even those not star rated - eg my current ones are michelin super sport and I can tell you they blow the original dunlop runflats into the weeds.
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